future events

Carbononics - Future of Microelectronics?

Speaker:Prof. Pawel Hawrylak
Affiliation:Quantum Theory Group Department of Physics, University of Ottawa, Ottawa ON Canada, K1N 6N5
Organizer: David Gershoni
Time:14:30 - 15:30
Location:Lidow Rosen Auditorium (323)

We describe here results of our recent theoretical work aiming at design of graphene nanostructures capable of realizing the three functionalities of a quantum circuit: electronics, photonics and spintronics, in a single material and at the nanoscale[1]. Integration of these different functionalities using graphene quantum dots may enable a unified approach to Information and Communication Technologies - carbononics. The design tools include size, shape, type of edge, sublattice symmetry, topology, number of layers and carrier density in graphene quantum dots[1-7]. In particular, engineering sublattice symmetry opens new opportunities in voltage and light control of magnetic moments, size engineering leads to optical gaps from THz to UV while shape engineering leads to a degenerate exciton spectrum allowing for the generation of entangled photon pairs via XX-X cascade[7]. Geometry and e-e interactions allow for the integration of topologically protected states of matter into carbononics[8-10]. The effect of replacing carbon atoms with W and S2 and resulting valley effects [11] , including possible broken symmetry Valley Polarized state will be given[11].



[1] A.D.Guclu, P.Potasz, M. Korkusinski and P.Hawrylak,”Graphene Quantum Dots”, Springer 2014.

[2] A.D.Guclu,P. Potasz, O.Voznyy, M. Korkusinski, P. Hawrylak, Phys.Rev.Lett.103,246805 (2009).

[3] A. D. Güçlü, P. Potasz and  P. Hawrylak, Phys. Rev. B 84, 035425 (2011).

[4] P. Potasz, A. D. Güçlü , A.Wojs  and P. Hawrylak, Phys. Rev. B 85, 075431 (2012).

[5] D.Guclu and P.Hawrylak, Phys. Rev. B87, 035425 (2013).

[6] I.Ozfidan,M.Korkusinski, A.D.Güçlü,J.McGuire,P. Hawrylak,Phys. Rev. B. 89 085310 (2014)

[7] I.Ozfidan, M. Korkusinski and P.Hawrylak, Phys.Rev.B91, 115314(2015).

[8] D.Guclu, M.Grabowski and P.Hawrylak, Phys.Rev. B87, 035435 (2013).

[9] Isil Ozfidan, M. Vladisavljevic, Marek Korkusinski, and Pawel Hawrylak (to be published).

[10]Marek Korkusinski and Pawel Hawrylak, Nature Scientific Reports 4, 4903(2014).

[11] T. Scrace, Y. Tsai, B. Barman, L. Schweidenback, A. Petrou, G. Kioseoglou, I. Ozfidan, M. Korkusinski, and P. Hawrylak, Nature Nanotechnology 10, 603 (2015) .